I am a straight-A student from the US who has lots of experience helping Korean pupils do WELL on the TOEIC exam. I have custom material for you to use. UCLA English graduate (#1 public university in the US based on multiple sources, incl US News & World Report).
You will not regret hiring me as I am fairly-priced and I can send you all the recordings of our sessions if interested.
30000 won per hour (individual) and 20000 won per hour (group lessons -- 4 or fewer people).